Question

The energy of an electron in the second orbit of hydrogen atom is -E.The energy of an electron in the first orbit will be

Answer 1

Explanation:

Energy in Bohr orbit = −13.6

n

2

z

2

eV

Energy of second orbit of hydrogen = −13.6×

2

2

1

2

eV=−3.4eV

Now in the given options the right answer will have its

n

z

=

2

1

Finding

n

z

of each option gives fourth orbit of He

+

as z=2,n=4

⟹

n

z

=

2

1

and E

4

(forHe

+

)=−

z

2

13.6

eV=−3.4eV